The Patronus is the most famous (and famously difficult) defensive charm. The aim is to produce a silvery-white guardian or protector, which takes the form of an animal. ... One of the most powerful defensive charms known to wizardkind, the Patronus can also be used as a messenger between wizards.

What does a Patronus represent?

According to the eighteenth-century Charms researcher Professor Catullus Spangle, the Patronus 'represents that which is hidden, unknown but necessary within the personality'.

What is the best Patronus?